Search Publications
Analytical determination of orbital elements using Fourier analysis. II. Gaia astrometry and its combination with radial velocities
Ségransan, D.; Delisle, J. -B.
The ESA global astrometry space mission Gaia has been monitoring the position of a billion stars since 2014. The analysis of such a massive dataset is challenging in terms of the data processing involved. In particular, the blind detection and characterization of single or multiple companions to stars (planets, brown dwarfs, or stars) using Gaia a…
An analysis of the most distant cataloged open clusters. Re-assessing fundamental parameters with Gaia EDR3 and ASteCA
Perren, G. I.; Pera, M. S.; Navone, H. D. +1 more
Context. Several studies have been presented in the last few years applying some kind of automatic processing of data to estimate the fundamental parameters of open clusters. These parameters are then employed in larger scale analyses, for example the structure of the Galaxy's spiral arms. The distance is one of the most straightforward parameters…
disnht: Modeling X-ray absorption from distributed column densities
Bianchi, Stefano; Ponti, Gabriele; Locatelli, Nicola
Collecting and analyzing X-ray photons over either spatial or temporal scales encompassing varying optical depth values requires knowledge about the optical depth distribution. For a sufficiently broad optical depth distribution, assuming a single column density value leads to a misleading interpretation of the source emission properties, nominall…
Important stellar perturbers found during the StePPeD database update based on Gaia EDR3 data
Dybczyński, Piotr A.; Berski, Filip; Tokarek, Jakub +3 more
Context. In 2020, the initial version of the Stellar Potential Perturbers Database (StePPeD) was presented with the aim to deliver up-to-date information on the stars and stellar systems that may perturb a long-period comet motion. We used the minimal distance between a star and the Sun as a selecting tool when compiling a list of interesting obje…
Extra-tidal star candidates in globular clusters of the Sagittarius dwarf spheroidal galaxy
Carballo-Bello, Julio A.; Minniti, Dante; Fernández-Trincado, José G. +4 more
Context. Globular clusters (GCs) associated with the Sagittarius dwarf spheroidal galaxy (Sgr dSph) have evolved under the gravitational potential of both Sgr dSph and the Milky Way. The effects of these potentials are most pronounced in the extra-tidal regions as compared to the central regions of the GCs.
Aims: We aim to study the extra-tid…
Radio emission in a nearby, ultra-cool dwarf binary: A multifrequency study
Rebolo, R.; Béjar, V. J. S.; Zapatero Osorio, M. R. +8 more
Context. The substellar triple system VHS J125601.92−125723.9 (hereafter VHS 1256−1257) is composed of an equal-mass M7.5 brown dwarf binary and an L7 low-mass substellar object. In Guirado et al. (2018, A&A, 610, A23) we published the detection of radio emission at 8.4 GHz coming from the central binary and making it an excellent target for f…
Evolution of coronal hole solar wind in the inner heliosphere: Combined observations by Solar Orbiter and Parker Solar Probe
Perri, S.; Lavraud, B.; Maksimovic, M. +18 more
We study the radial evolution, from 0.1 AU to the Earth, of a homogeneous recurrent fast wind, coming from the same source on the Sun, by means of new measurements by both Solar Orbiter and Parker Solar Probe. With respect to previous radial studies, we extend, for the first time, the analysis of a recurrent fast stream at distances never reached …
WD 1145+017: Alternative models of the atmosphere, dust clouds, and gas rings
Budaj, J.; Hubeny, I.; Maliuk, A.
Context. WD 1145+017 (WD1145) is the first white dwarf known to be orbited by disintegrating exoasteroids. It is a DBZ-type white dwarf with strongly variable broad circumstellar lines and variable shallow ultraviolet (UV) transits. Various models of the dust clouds and gaseous rings have been proposed as an explanation for this behavior.
Aim…
Nano-grain depletion in photon-dominated regions
Abergel, A.; Ysard, N.; Habart, E. +3 more
Context. Carbonaceous nano-grains play a fundamental role in the physico-chemistry of the interstellar medium (ISM) and especially of photon-dominated regions (PDRs). Their properties vary with the local physical conditions and affect the local chemistry and dynamics.
Aims: We aim to highlight the evolution of carbonaceous nano-grains in thre…
J-PLUS: Detecting and studying extragalactic globular clusters. The case of NGC 1023
Cortesi, Arianna; Chies-Santos, Ana L.; Forbes, Duncan A. +19 more
Context. Extragalactic globular clusters (GCs) are key objects in studies of galactic histories. The advent of wide-field surveys, such as the Javalambre Photometric Local Universe Survey (J-PLUS), offers new possibilities for the study of these systems.
Aims: We performed the first study of GCs in J-PLUS to recover information on the history…